Belba184

I have a 2000 coupe that i have replaced the belts on twice already. the chirp goes away for approximately 3 weeks then comes back. Any idea what causes this or how to fix it?

C5 Diag

Hope this video helps !!

DDaaryl

Check the harmonic balancer at the end of the crankshaft and make sure it doesn't wobble. It's a common C5 problem and fixing it requires removal of the steering rack.

grantv

Could be one of the pulleys, or the HB as noted above. Could even be the belts, many swear by Continental Elite belts including myself.
Check the HB for wobbling, check all pulleys are aligned. If all seems good, pull belts and check each pulley.

Robrote

Pull the alternator belt and isolate the issue. If the noise goes away, you have about 6 things it could be. If it doesn't go away, you're down to 3 (assuming the AC clutch isn't screaming) .

Those items are:
Belt tensioner (common)
Idler pulley (common)
Alternator (not so common)
Water pump (not so common)
PS pump (rare)
Balancer (pray it's not this)

MikeG37

Put a paint mark across the face of your balancer to hopefully rule that out. If there's any slipping going on with the outer ring it'll be very easy to tell.

CinciZ06

Check your balancer for wobble as suggested. I had my '04 Z home for 3 days when my belt started chirping and squeaking. I hit it with some belt dressing to try and quiet it down while driving to the tire shop, and when I went to spray the crank pulley I noticed the damn thing was wobbling something awful.

Now, the part is only about $80 from Jegs or Summit, but it's a project to replace. To be honest, it was not difficult at all, and probably takes about 5 hours of work using the instructions on this forum. Hopefully you don't have to worry with this and it's simply an idler pulley or something.

Josephu

19 year old isolator rubber degrades from heat and time. Just change it.. why play Russian roulette. Its a known defect. You dont want to know the scenerio if it comes apart. Of coarse this is just my opinion. Dont cheap out on the new one. Powerbond/Dayco PB1117N..SS..Race, SFI approved from summit or jegs $260 bucks. Good intermediate price. You dont need an ATI, unless you are building a race motor. Get ahold of a Corvette club in your area. They know who the good mechanics are in your area. Some of these guys do work on the side and might do it for less than the $600 bucks stated. They usually have all the necessary tools, and probably a lift. New crank seal is about $25 bucks. Good luck..

zachaeous

As stated above if it is your balancer go with a aftermarket. I rebuilt the motor in my 2001 in 2015. I replaced the balancer with a brand new AC OEM replacement part. It did not last two months and started wobbling and the belt chirping. Of course the new Delco unit came with a warranty but it did not cover the labor to replace it. I went with the Power Bond OEM replacement balancer and to make a long story short it is running as straight as a arrow 4 years and many miles later. Good luck finding your problem.

Daytona69

I had the same issue with my 2000 and it was the harmonic balancer. Went ahead and replaced it with a Power Bond OEM balancer along with an ARP bolt and new belts...good as new

Vetteman Jack

Moved to C5 Tech.